Thermostatic heat or fire alarm.



G. S. SIMPSON. THERMOSTA'TIG HEAT 0R FIRE ALARM.

APPLICATION FILED MAY 23, 1912.

1,074,654, Patented Oct. 7, 1913.

GEORGE SNYDER SIMPSON, OF MORGANTOWN, WEST VIRGINIA,

TBBIIOSTATIC HEAT 0B IIBZI']v ALAZBM.

fipeoifloation of Letters Patent.

Patented Oct. 7.11113.

Application filed May 28, 1912. Serial No. 699,204.

To all whom it may concern Be it known that I, GEORGE SNYDER SIMP- soN, a citizen of .the United States, residing at Morgantown, in the county of Monongalia and State of Test Virginia, have invented new and useful Improvements in Thermostatic Heat or Fire Alarms, of which the following is a specification.

This invention relates to improvements in thermostatic heat or fire alarms of that general type which embodies an expansible body and a circuit closer operated thereby.

The object of the-invention is to provide a simple and compact construction 0 the type referred to, which shall be sensitive and reliable in its action, and in which the parts are readily accessible for any purposes de sired.

An embodiment of the-invention is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation, partly in longitudinal section; and Fig. 2 is a section on the line 22 ofFig. 1.

Similar characters of reference designate corresponding parts throughout the several views.

The operating parts are mounted upon a suitable base 1 which is to be attached to a wall and may be of any desired form. The base 1 may carry any suitable contact device, for example and preferably, a push button device, comprehending the contacts 2 and 3 and the push button 4., by which the contact 3 may be engaged with the contact 2. The base 1 also forms an anchorage for support ing posts 5, four of which are preferably employed. The posts 5 project perpendicularly from said base and pass through openings in plates 6 and 7. The plate 6 is deter minately spaced from the base by sleeves 8 which surround the posts 5, and the plate 7 is similarly spaced from the plate 6 by sleeves 9.

The plate 6 forms a gpide for an axially projecting stem 10 whic is provided at the inner end of an expansible body, indicated generally at 11, and the plate 7 forms an anchorage for said body at the outer end thereof. The body 11 is preferably made up of separable sections and, in the instance disclosed, comprises inner and outer cuplike heads 12 and 13, and intermedlate sectlons ber.

14. The stem 10 is carried by the head 12. The sections 14 are similar in construction and any desired number of them may be em'- ployed. Two of these sections are shown and each comprises cup-like members 15 and 16 and an axial tube 17 connecting said mem- The member 15 is of slightly greater diameter than the member 16 and receives the adjacent cup-like part in closely fitting telescoping relation. The head 12 fits within the member 15 of one section and the member 16 of the same section fits within the member 15 of the next section, and the member 16 of the latter fits Within the head 13. The engagement of the interfitting cup-like members is sufficiently close to be effectually air tight, yet it does, not interfere with the ready expansion or distention of the body 11 when the latter is subjected to heat.

The body 11 may be directly connected to the plate 7 It is preferred, however, to provide said body with a swiveled adjusting screw 18 which is threaded through a central opening in the plate? and by means of which a preliminary adjustment of the position of the body 11, with reference to the button 4 or to the contact 3, may be made. In this way it is possible to set the device to operate when the heat has reached some determined degree. The stem 10 passes through a cen tral opening 19 of the plate 6 and is in line with, and, in most instances, in contact v ith, the button 4 which it forces inwardly when the body 11 expands.

The alarm device may be of any suitable character. An electric bell 20 is shown, which is wired in the usual way to the con tacts 2 and 3.

Having fully described my invention, I claim:

A device of the type set forth, comprising a base having contacts associated therewith and a push button for operatin contacts, a plurality of posts pro ecting from the base, a pair of plates mounted in spaced relation on the posts, one of the plates being intermediate the other plate and the base and having an opening, an expansible body arranged between the plates and including cup-like end heads located adj aoent the plates and sections intermediate said heads and each including cup-like members and connecting tubes, the adjacent cup-like parts one of the telescopically interfitting relation, my hand in presence of two subscribing witthe cup-like end head ad acent the inner nesses.

'ilato haying a stem which projects through 10 the opening of said plate for engagement GEORGE SNYDER SIMPSON 5 with said push; button,; the other cup-like Witnesses: Q

end head being anchored to the outer plate. J. M. Gum, In testimony whereof I have hereunto set C. H. Lnmmcx. 

